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Class Information
Number: 418/201.2
Name: Rotary expansible chamber devices > Interengaging rotating members > Helical or herringbone > With valve
Description: Apparatus wherein there is provided a means to regulate fluid flow.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7588430 |
Screw compressor |
Sep. 15, 2009 |
| 7568898 |
Compressor sound suppression |
Aug. 4, 2009 |
| 7547203 |
Screw compressor |
Jun. 16, 2009 |
| 7481634 |
Volumetric screw compressor provided with delivery adjustment device |
Jan. 27, 2009 |
| 7374406 |
System and method for reducing noise in multi-capacity compressors |
May. 20, 2008 |
| 7201569 |
Screw compressor |
Apr. 10, 2007 |
| 7165949 |
Cavitation noise reduction system for a rotary screw vacuum pump |
Jan. 23, 2007 |
| 6964560 |
Vacuum pump |
Nov. 15, 2005 |
| 6913452 |
Offset thread screw rotor device |
Jul. 5, 2005 |
| 6874486 |
Supercharger with multiple backflow ports for noise control |
Apr. 5, 2005 |
| 6860730 |
Methods and apparatus for unloading a screw compressor |
Mar. 1, 2005 |
| 6823686 |
Pressure equalization system and method |
Nov. 30, 2004 |
| 6811384 |
Automatic regulator of intake air in a tank |
Nov. 2, 2004 |
| 6739853 |
Compact control mechanism for axial motion control valves in helical screw compressors |
May. 25, 2004 |
| 6679689 |
Screw compressor |
Jan. 20, 2004 |
| 6652250 |
Screw compressor having intermediate shaft bearing |
Nov. 25, 2003 |
| 6638042 |
Asymmetric porting for multi-rotor screw compressor |
Oct. 28, 2003 |
| 6599112 |
Offset thread screw rotor device |
Jul. 29, 2003 |
| 6584791 |
Pressure equalization system and method |
Jul. 1, 2003 |
| 6572350 |
Screw compressor |
Jun. 3, 2003 |
| 6520758 |
Screw compressor assembly and method including a rotor having a thrust piston |
Feb. 18, 2003 |
| 6494699 |
Axial unloading lift valve for a compressor and method of making the same |
Dec. 17, 2002 |
| 6461119 |
Lift valve for a rotary screw compressor |
Oct. 8, 2002 |
| 6422846 |
Low pressure unloader mechanism |
Jul. 23, 2002 |
| 6409490 |
Rotary screw compressor with slide valve and slide stop guidance bushings |
Jun. 25, 2002 |
| 6375443 |
Screw rotor type wet vacuum pump |
Apr. 23, 2002 |
| 6371742 |
Cooling device |
Apr. 16, 2002 |
| 6364645 |
Screw compressor having a compressor screw housing and a spaced outer housing |
Apr. 2, 2002 |
| 6338616 |
Screw rotor compressor having a movable wall portion |
Jan. 15, 2002 |
| 6302668 |
Capacity regulating apparatus for compressors |
Oct. 16, 2001 |
| 6276911 |
Screw compressor |
Aug. 21, 2001 |
| 6227834 |
Screw compressor with adjustment slide means |
May. 8, 2001 |
| 6176695 |
Control of a lobed rotor machine |
Jan. 23, 2001 |
| 6139280 |
Electric switch gauge for screw compressors |
Oct. 31, 2000 |
| 6135744 |
Piston unloader arrangement for screw compressors |
Oct. 24, 2000 |
| 6129533 |
Sealing system for rotating component of a pump |
Oct. 10, 2000 |
| 6105378 |
Variable capacity vapor compression cooling system |
Aug. 22, 2000 |
| 6082985 |
Screw compressor |
Jul. 4, 2000 |
| 6022203 |
Variable-displacement screw-type compressor |
Feb. 8, 2000 |
| 5979168 |
Single-source gas actuation for screw compressor slide valve assembly |
Nov. 9, 1999 |
| RE36281 |
Valve system for capacity control of a screw compressor and method of manufacturing such valves |
Aug. 24, 1999 |
| RE36274 |
Method of manufacturing valve system for capacity control of a screw compressor |
Aug. 24, 1999 |
| 5860801 |
Rotary screw compressor with unloading means |
Jan. 19, 1999 |
| 5832737 |
Gas actuated slide valve in a screw compressor |
Nov. 10, 1998 |
| 5829957 |
Screw fluid machine and screw gear used in the same |
Nov. 3, 1998 |
| 5791315 |
Control system for screw type supercharging apparatus |
Aug. 11, 1998 |
| 5779451 |
Power efficient multi-stage twin screw pump |
Jul. 14, 1998 |
| 5775117 |
Variable capacity vapor compression cooling system |
Jul. 7, 1998 |
| 5738497 |
Apparatus and method for controlling a rotary screw compressor |
Apr. 14, 1998 |
| 5713724 |
System and methods for controlling rotary screw compressors |
Feb. 3, 1998 |
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